docs: def filter_all(self, line):
          """Doing all filters for specified line
  
          return filtered lines as list
          For using with adaptive filters
          """
          lines = [None] * 5
          for filter_type in range(5):  # range save more than 'optimised' order
              res = copyBarray(line)
              self._filter_scanline(filter_type, line, res)
              res.insert(0, filter_type)
              lines[filter_type] = res
          return lines